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Pvc transparent film production and PVC production process
May 18, 2018

Pvc is also the common plastic material in our lives. The cling film we use is a pvc transparent film. PVC film has many characteristics, among them transparency, light weight, hardness can be strong and weak, low cost, mass production of these features make this polymer has become the second largest production of plastic materials, in all parts of the world See its "body figure."

The main method of producing PVC is the suspension method, which is also a method of producing PVC film. The polymerization process was carried out in an agitated reactor with intermittent operation. The reaction process includes a non-ionized water metering control system, a polymerizer temperature control system, and a buffer metering control system.

The polymerization process is operated by means of hot water feeding, that is, no ionized water is heated to about 48 degrees Celsius and then added to the polymerization tank to increase the temperature of the raw materials in the tank and shorten the heating time. The non-ionized water uses two turbine flowmeters connected in series in the same feeding pipeline, with a distance of 2.5m. The temperature of ion-free water mixed with cold and hot ion-free water adopts split-range control to control the cold and hot ion-free water control valves respectively. After the mixing, the temperature compensates for the non-ionized water flow of the feed. It involves the instrument for measuring the volume of the feed and the feed meter, which is used for metering and controls the opening of the feed control valve by the controller. The feed pressure has a minimum soft limit value. When the feed pressure is lower than the set value, the pressure controller replaces the flow controller to control the feed amount to prevent vaporization of the feed due to low outlet pressure of the turbine flow meter. Causes flowmeter reading error. If the meter fails, the system also sets the metering tank and uses the weighing instrument for calibration. In order to make the measurement correct, the control system sets two feed flow rates, full flow rate and micro flow rate, which can reach 136m3/h at full flow rate and only 23m3/h at micro flow rate. When the measurement is close to the undetermined metering value, the control The system uses a micro flow rate to control the feed until the feed control valve is closed when the set metering value is reached. The entire control system is implemented with a computer control device. Therefore, a feed cut-off solenoid valve is also provided behind the feed control valve to automatically open and close the metering control system.

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